7861945 has 32 divisors (see below), whose sum is σ = 11950848. Its totient is φ = 4831488.

The previous prime is 7861933. The next prime is 7861951. The reversal of 7861945 is 5491687.

It is a cyclic number.

It is not a de Polignac number, because 7861945 - 2¹³ = 7853753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7861898 and 7861907.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16602 + ... + 17068.

It is an arithmetic number, because the mean of its divisors is an integer number (373464).

Almost surely, 2^7861945 is an apocalyptic number.

It is an amenable number.

7861945 is a deficient number, since it is larger than the sum of its proper divisors (4088903).

7861945 is a wasteful number, since it uses less digits than its factorization.

7861945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529.

The product of its digits is 60480, while the sum is 40.

The square root of 7861945 is about 2803.9160115809. The cubic root of 7861945 is about 198.8428597099.

The spelling of 7861945 in words is "seven million, eight hundred sixty-one thousand, nine hundred forty-five".